Build/Test Tools: Update third-party GitHub Actions to latest versions.

Updated actions:
- `actions/cache`
- `actions/github-script`
- `actions/setup-node`
- `bubkoo/welcome-action`
- `shivammathur/setup-php`
- `slackapi/slack-github-action`

See #55652.

git-svn-id: https://develop.svn.wordpress.org/trunk@53940 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/javascript-tests.yml

@@ -67,7 +67,7 @@ jobs:
           svn --version
 
       - name: Install NodeJS
-        uses: actions/setup-node@eeb10cff27034e7acf239c5d29f62154018672fd # v3.3.0
+        uses: actions/setup-node@2fddd8803e2f5c9604345a0b591c3020ee971a93 # v3.4.1
         with:
           node-version-file: '.nvmrc'
           cache: npm